Device for packing rods, &amp;c.



PATENTED MAY 5, 1903;

- H. LENTZ.

DEVIGE FOR PACKING RODS, 6m. APPLIUATION PIIJED FEB. 13, 1902.

N0 MODEL.

WITNESSES: Ww WJ UNITED STATES Patented May 5, 1903.

OFFICE.

HUGO-LENTZ, OF MAGDEBURG, GERMANY.

DEVICE FOR PACKING RODS, 800.

SPECIFICATION forming part of Letters Patent No. 726,953, dated May 5, 1903. Application filed February 13, 1902. Serial No. 93,835. 7 (No model.)

To all whom it may concern.-

Be it known that I, HUGO LENTZ, a subject of the King ofPrussia, GermanEmperor, and.

a resident of Magdeburg, in the Kingdom of Prussia, German Empire, have invented cer tain new and useful Improvements in Devices for Packing Rods, Spindles, Shafts, and the Like, of which the following is a full, clear, and exact description.

This invention has-for its object a device for packing rods, spindles, shafts, and the like Without the use of pressure-springs and the like, which device is adapted to admit of lateral movement of the shaft without injury to the maintenance of a tight packing.

The arrangement is characterized by the separate chambers of a so-called labyrinthgland being closed by laterally-movable easily-fitted rings.

The arrangement is shown in the accompanying drawings, Figure 1 being a longitudinal section, and Figs. 2, 3, and 4.- pressurediagrams, while Figs. 5 and 6 are details of construction. vI

The arrangement consists of rings a 0. a a a and b b 72 h The rings marked a a a a a are so bored out that between them and the shaft is a space for play exists and chainbers I II III are formed. The rings indicated by b b b surround the shaft 70 in such a way that the latter can still move easily, and they are so fitted between the outer rings a a, a a a that they can adjust themselves between these latter in the event of lateral movement of the shaft is. One of'the last chambers communicates with the outer air or with a condenser, for instance, by means of a pipe 1'.

The mode of action of this arrangement is as follows: As the diagram Fig. 2 shows, assuming pressure to exist in the chamber 0, which is to be closedfor instance, a steam cylinder-a small portion of the power mediumfor instance, steam-will in time force itself during the charging pe'riod through the fine interstices between the separate rings a and hand between the shaft is and the rings 1), so that an excess pressure also is formed in the chambers I II III; but this pressure is considerably less than that in the chamber 0 by reason of the great throttling which this pressure medium undergoes in forcing its way through theinterstices'. Figs. 3and4show the diagramsofthe pressures which exist in the succeeding chambers I II. As the power medium requires a certain time to penetrate the interstices, the maximum pressure in one of the-chambers, for instance, will only be reached later than in the preceding one, and the succeedingjdiagrams are thus relatively displaced-that is to say, it may happen that in the following chamber momentarily a greater pressure exists than in the preceding one, as is shown, for instance, at A in Figs. 2 and 3. The smallest part of the power medium which haslpenetrated into the chamber III, together with condensed water and lubricant or lubricating-oil, is finally removed through the pipe r in order not to foul the machine. Should the rings 1) be too loosely fitted or the shaft become worn by reason of lateral play, the interstices between them and the rings a increase. a This has, however, no deleterious influence on the tightness of the packing, as

if the pressure in 0 be greater than the pressure in I the ring I) is pressed against the ring ct and rests closely thereon. If it then happens thatfor instance, in the ordinates A, Figs: 2 and 3--the pressure in chamber I is greater than in the chamber 0, the ring I) is first lifted ofi the ring a in the same way as an automatic valve is lifted from its seat, so that spaces for play result at w y, Fig. 1, by means of which spaces the medium at a higher pressure may return from the chamber I-into the chamber 0. The dotted diagram in Fig. 3 corresponds to this returnflow of the medium. The ring I) is then only pressed against the ring a. Similar actions take place between each of the two succeeding chambers. In order to facilitate the discharge of the higher pressure from the fol-- ceding rings a adjoining them. When all the parts fit properly, the loss by leakages will be of itself extremely small. If the separate rings be Worn or badly fitted, the return-flow takes place and causes what would otherwise be large losses from leakage to remain very small.

Any suitable number of rings may be employed.

Having now described myinvention, What I claim as new, and desire to secure by Letters Patent, is

1. In combination with a rod or shaft, a 1 packing-box comprising a plurality of packing-rings, chambers in which said rings are loosely held, and a plurality of free pressure- Witnesses HEINR. KIHN, LUDWIG LIOHTENSTEINER. 

